| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 01/22/2013 | CA2656619C Method for improved well control with a downhole device |
| 01/17/2013 | WO2013009773A1 Multi-zone screened frac system |
| 01/17/2013 | WO2013009616A2 A double valve block and actuator assembly including same |
| 01/17/2013 | WO2013009458A2 Remotely activated downhole apparatus and methods |
| 01/17/2013 | WO2013007026A1 Disconnector of downhole tool |
| 01/17/2013 | WO2013006963A1 Internal riser rotating flow control device |
| 01/17/2013 | WO2012148749A3 Load balancing spherical diameter single seat ball system |
| 01/17/2013 | US20130014956 Wellbore circulation tool and method |
| 01/17/2013 | US20130014941 Remotely Activated Downhole Apparatus and Methods |
| 01/17/2013 | US20130014935 Control and supply unit |
| 01/17/2013 | US20130014933 Device for a Plug Construction for Conducting Well Tests |
| 01/17/2013 | CA2841609A1 Internal riser rotating flow control device |
| 01/17/2013 | CA2839010A1 Remotely activated downhole apparatus and methods |
| 01/17/2013 | CA2838552A1 Multi-zone screened frac system |
| 01/16/2013 | EP2545247A2 Well barrier |
| 01/16/2013 | CN202673263U Pressure control water injection well safety valve |
| 01/16/2013 | CN202673245U Compound electrohydraulic wellhead delay shutoff mechanism |
| 01/16/2013 | CN202673244U Feedback quick shut-off mechanism |
| 01/16/2013 | CN202673243U Ocean oil well hydraulic sliding sleeve device |
| 01/16/2013 | CN202673242U Double-plate safety float valve |
| 01/16/2013 | CN202673241U Intelligent underground acidification throttling valve for high-pressure gas well |
| 01/16/2013 | CN202673240U Coiled tubing delivering perforation double-plate type check valve |
| 01/16/2013 | CN202673239U Oil extraction valve plate treated by spraying tungsten |
| 01/16/2013 | CN202673238U Well mouth dual anti-theft sampler |
| 01/16/2013 | CN202673237U Antitheft wellhead pressure tapping device for oilfield |
| 01/16/2013 | CN202673236U Check valve for nitrogen injection |
| 01/16/2013 | CN202673235U Reversible type high pressure check valve |
| 01/16/2013 | CN202673234U Drilling tool back-pressure valve with improved structure |
| 01/16/2013 | CN102884276A Injection or other system with anti-thermal lockdown mechanism and related method |
| 01/16/2013 | CN102877814A Composite sealing plug valve with automatic control and manual control double control functions |
| 01/16/2013 | CN101748983B Protector for oil pipe working under pressure used for oil well |
| 01/16/2013 | CN101701514B Wax scraper for inner wall of oil pipe |
| 01/15/2013 | US8353353 Surface controlled subsurface safety valve assembly with primary and secondary valves |
| 01/15/2013 | CA2704834C Screened valve system for selective well stimulation and control |
| 01/10/2013 | WO2013006159A1 Well tool actuator and isolation valve for use in drilling operations |
| 01/10/2013 | WO2013004609A1 System and method for injecting a treatment fluid into a wellbore and a treatment fluid injection valve |
| 01/10/2013 | WO2012141753A4 Safety valve with electrical actuator and tubing pressure balancing |
| 01/10/2013 | WO2012115868A3 Multi-stage valve actuator |
| 01/10/2013 | US20130008668 Hydraulic Sleeve with Early Release Prevention |
| 01/10/2013 | US20130008667 Downhole deployment valves |
| 01/10/2013 | US20130008666 Method for conveying balls downhole using a ball carrier medium |
| 01/10/2013 | US20130008665 Method and apparatus for subsea wellhead encapsulation |
| 01/10/2013 | US20130008648 Apparatus and Method for Well Operations |
| 01/10/2013 | US20130008647 Apparatus and Method for Well Operations |
| 01/10/2013 | CA2840716A1 System and method for injecting a treatment fluid into a wellbore and a treatment fluid injection valve |
| 01/10/2013 | CA2837180A1 Well tool actuator and isolation valve for use in drilling operations |
| 01/09/2013 | EP2542754A2 Flow control arrangement and method |
| 01/09/2013 | CN202659212U Antitheft sleeve valve provided with lead screws and used for oil extraction wellhead |
| 01/09/2013 | CN202659211U Novel check valve for water injection well |
| 01/09/2013 | CN102865051A Electromagnetic drive stay-cord and pulley type down-hole sealing machine |
| 01/08/2013 | US8347969 Apparatus and method for compensating for pressure changes within an isolated annular space of a wellbore |
| 01/08/2013 | US8347967 Subsea tree safety control system |
| 01/08/2013 | US8347965 Apparatus and method for creating pressure pulses in a wellbore |
| 01/08/2013 | US8347963 Controlling transient underbalance in a wellbore |
| 01/08/2013 | US8347916 Self-sealing chemical injection line coupling |
| 01/08/2013 | CA2567632C Downhole isolation tool |
| 01/03/2013 | WO2012151036A3 A device for directing the flow of a fluid using a centrifugal switch |
| 01/03/2013 | WO2012138681A3 Method and apparatus for controlling fluid flow in an autonomous valve using a sticky switch |
| 01/03/2013 | WO2012135219A3 Thermally-actuated gas lift safety valve |
| 01/03/2013 | WO2012104574A3 Downhole pressure relief apparatus |
| 01/03/2013 | WO2012094164A3 Method and apparatus for multi-drop tool control |
| 01/03/2013 | WO2012002817A3 Valve assembly |
| 01/03/2013 | US20130000922 Well tool actuator and isolation valve for use in drilling operations |
| 01/03/2013 | US20130000921 Apparatus to remotely actuate valves and method thereof |
| 01/03/2013 | US20130000917 Casing fill-up fluid management tool |
| 01/02/2013 | EP2539538A1 Shunt isolation valve |
| 01/02/2013 | EP2539532A2 Pressure-activated valve for hybrid coiled tubing jointed tubing tool string |
| 01/02/2013 | CN202645537U Inseparable multi-well alternation metering combined device |
| 01/02/2013 | CN202645528U Separated and separately transported multi-well alternating measuring combination device |
| 01/02/2013 | CN202645515U Self-actuated gas recovery device |
| 01/02/2013 | CN202645507U Intelligent pumping unit downhole pressure switch |
| 01/02/2013 | CN202645506U Pulse valve type underground anti-spraying device |
| 01/02/2013 | CN202645505U Ball seat for under-pressure operation |
| 01/02/2013 | CN202645504U Alloy plug valve |
| 01/02/2013 | CN202645503U Bowling-type fracture sliding bush for oil and gas well |
| 01/02/2013 | CN202645502U Unloading valve for well opening safety control system |
| 01/02/2013 | CN202645501U Throttling blowout manifold and well control safety device using throttling blowout manifold |
| 01/02/2013 | CN202645500U Anti-theft gate for casing pipe of oil extraction wellhead |
| 01/02/2013 | CN202645499U Recoverable throw-in type check valve |
| 01/02/2013 | CN202645498U Fluid hardening and tempering machine |
| 01/02/2013 | CN202645497U Shockproof flow distributor for injecting polymer solution into oil well |
| 01/02/2013 | CN102859112A Downhole tool with expandable seat |
| 01/02/2013 | CN102003177B Hydrogeological parameter observation instrument for underground single drill hole |
| 01/02/2013 | CN101432501B Multi-zone, single trip well completion system and methods of use |
| 01/01/2013 | US8342247 Safety valve having mono spring closure mechanism |
| 12/27/2012 | WO2012178043A2 Injection line valve mechanism |
| 12/27/2012 | WO2012175028A1 Slip-on fracturing component, device using same and method for device use |
| 12/27/2012 | WO2012174662A1 Kobe sub with inflow control, wellbore tubing string and method |
| 12/27/2012 | WO2012174600A1 A flushing tool and method of flushing perforated tubing |
| 12/27/2012 | WO2012143775A3 Ball valve safety plug |
| 12/27/2012 | WO2012094194A3 Low equivalent circulation density setting tool |
| 12/27/2012 | US20120325495 Downhole deployment valves |
| 12/27/2012 | US20120325494 Downhole deployment valves |
| 12/27/2012 | US20120325493 Injection line valve mechanism |
| 12/27/2012 | US20120325491 Subsea safety valve system |
| 12/27/2012 | US20120325484 Integrated zonal contact and intelligent completion system |
| 12/27/2012 | US20120325479 Coiled tubing bottom hole assembly with packer and anchor assembly |
| 12/27/2012 | CA2839377A1 Sleeve fracturing assembly, device using the same and method for using the same |
| 12/27/2012 | CA2837771A1 Kobe sub with inflow control, wellbore tubing string and method |
| 12/26/2012 | EP2536917A2 Valve system |